import { Observable } from '../Observable';
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import { Falsy, OperatorFunction } from '../types';
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export declare function findIndex<T>(predicate: BooleanConstructor): OperatorFunction<T, T extends Falsy ? -1 : number>;
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/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
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export declare function findIndex<T>(predicate: BooleanConstructor, thisArg: any): OperatorFunction<T, T extends Falsy ? -1 : number>;
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/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
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export declare function findIndex<T, A>(predicate: (this: A, value: T, index: number, source: Observable<T>) => boolean, thisArg: A): OperatorFunction<T, number>;
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export declare function findIndex<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean): OperatorFunction<T, number>;
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//# sourceMappingURL=findIndex.d.ts.map
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